No, Major League Baseball does not have a rule about teams wearing the same colour jersey in a game. Keep in mind it happens all the time during Spring Training, and players seem to have no issue with it during the month-plus of that.

Going through the seven seasons we’ve been running our MLB Uniform Tracker we could find six games in which both teams wore the same coloured jersey. I don’t just mean royal blue vs powder blue, we’re talking the same colour here – navy blue vs navy blue, red vs red, and even a couple white vs white.

What’s kinda interesting here? Half of these same colour matchups are between the Astros and Mariners.

A look back starting with Sunday’s game and moving back from there:

There are a few earlier examples that pre-date our tracker that I could think of, a Royals-Blue Jays game in which both teams wore their alternate royal blue jerseys in 1995 came to mind. Any others that you can think of? (The Cubs-Indians World Series was royal vs navy) Share in the comments.